Day 4 of Google's 10-cent app promo

Day 4 of Google's 10-cent app promo


It is now day 4 of Google's 10-cent app promo... and here is what we have today.
I did not buy anything in Day 3 and wondering when they give Flight Track is offered for 10-cents (it is in the banner after all). I will leave you to ponder what to buy as I do the same.